Make Tamron PK Adaptall 2 into P/KA.

Started May 16, 2011 | Discussions thread
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brandrx
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Make Tamron PK Adaptall 2 into P/KA.
May 16, 2011

Here is something you can try with a PK adapter.

This example is for a Tamron SP 400mm f4 Adaptall 2 lens. You should be able to figure out the correct taping for other Tamron Adaptall 2 lenses. For instance tape pins 2, 3, and 5 and short the A pin for a Tamron SP 300mm f2.8 Adaptall 2 lens using a PK adapter. Actually you should be able to figure out how to do this with any K or M lens.

Go to

http://www.robertstech.com/matrix.htm

...and follow the pin layout for the "Body" as I tell you stuff below.

On the Pentax-F 1.7X AF Adapter, where the lens attaches, put a peice of scotch tape over pins 1, 3, and 5. Next double a peice of aluminum foil and tape it so that it shorts out the "A" pin. Attach your Tamron SP 400/4 lens and set it so that the aperture at the lens is on 32. Now you should be able to use the lens like an "A" lens. Turn on the camera and set the SR to 700mm. Set the mode to Av. If everything was done properly you should now be able to control the aperture from the camera from f6.7 to f57. If you set the exposure bias to about +0.7 then you should get pretty good exposures at the apertures you are most likely to use (f6.7 through f13).

If you use the lens without the Pentax-F 1.7X AF Adapter and want to control the aperture from the camera using a PK adapter then do the same thing (shorting pin A and taping pins 1, 3, and 5) on the camera body. Now you can control the aperture from the camera from f4 to f32.

With that being said, still the best thing to do is find a P/KA adapter.

Cheers.

Ron

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'Keep your eyes looking forward. However, glance back now and then to see where you've come from. It will put a smile on your face.' ~ brandrx

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